1 Department of Anatomy & Physiology, Kansas State University, 1800 Denison Avenue, Mosier P217, Manhattan, KS 66506, USA. Electronic address: sensley01@ksu.edu.
2 Department of Veterinary Pathobiology, Veterinary Medical Diagnostic Laboratory, University of Missouri, 810 East Campus Loop, Columbia, MO 65211, USA. Electronic address: evanst@missouri.edu.